Show Full Directory Path in Mac OS X Finder Window Title Bars
The geekier amongst us and those familiar with Unix should really like this trick. You can have Mac OS X display the full directory path in the Finder window title bar by issuing a simple command from the Terminal.
defaults write com.apple.finder _FXShowPosixPathInTitle -bool YES
Then you’ll want to kill the Finder for changes to take effect:
To disable the full path title bars and revert back to the default, simply repeat the command with NO instead of YES as the operator:
defaults write com.apple.finder _FXShowPosixPathInTitle -bool NO
This works with any version of OS X beyond 10.5, including 10.6, 10.7, and (apparently) 10.8.